… if we further assume that the atmosphere has been well mixed by turbulent motion, so that all the molecules have scattered in the course of the last two thousand years, it follows that every time we breath we inhale at least one molecule of breath that Julius Caesar exaled when he was murdered in the Roman Senate house in 44 B.C. …
[PP Wegener, in What Makes Airplanes Fly ? , 1991]

The helicopter appeared so reluctant to fly forward that we even considered turning the pilot’s seat around and letting it fly backward.
[Igor Sikorsky, 1940, about his prototype VS-300 that would only fly backward and sideways]